Delete row ('851', '20731') from daily_volatility

ticker_id 851
day 20731
implied_open 0.7794383362396284
implied_high 0.795312844106016
implied_low 0.6826038382546643
implied_close 0.7461018697202146
historical_open 0.5571952261102028
historical_high 0.5571952261102028
historical_low 0.5571952261102028
historical_close 0.5571952261102028
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